I do not have a Double rifle, if I did I would put an Aimpoint on it. I had an Aimpoint on my old 35 Whelen and one will be going on my new Whelen.

A bit pricey compared to some but paralax free, and ruged/strong as all get out. A fifty cal does not upset them. Very easy to find the dot unlike some helo sights, batteries last forever. I used mine out to 500mts in my younger day. That was at steel rams but in the bush out to 300mts.